<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <!-- 信息提示 -->
      <el-alert title="添加商品信息" type="info" center show-icon :closable="false">
      </el-alert>
      <!-- 步骤条区域 -->
      <el-steps :space="200" :active="activeIndex-0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- 标签区域 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-position='top'
        label-width="100px">
        <el-tabs @tab-click="tabsClick" :before-leave="beforeTabLeave" v-model="activeIndex"
          :tab-position="'left'">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input type="number" v-model="addForm.goods_price"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input type="number" v-model="addForm.goods_weight"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input type="number" v-model="addForm.goods_number"></el-input>
            </el-form-item>
            <!-- 级联选择器区域 -->
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader v-model="addForm.goods_cat" :options="cardList" :props="caseProps"
                expandTrigger='hover' @change="handleChange"></el-cascader>
            </el-form-item>
          </el-tab-pane>

          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单item 想 -->
            <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox v-for="(name,i) in item.attr_vals" border :key="i" :label="name">
                </el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>

          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>

          <el-tab-pane label="商品图片" name="3">
            <!-- active : 表示图片上传到的API地址 -->
            <el-upload :headers='headerObj' :action="uploadURL" :on-preview="handlePreview"
              :on-remove="handleRemove" list-type="picture" :on-success="handleSuccess">
              <el-button size="small" type="primary">点击上传</el-button>

            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器区域 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!-- 添加商品按钮 -->
            <el-button class="addBtn" @click="Add" type="primary">添加商品</el-button>

          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

    <!-- 预览图片对话框 -->
    <el-dialog title="预览图片" :visible.sync="prevDialogVisible" width="50%">
      <span>这是一段信息</span>
      <img :src="prevPathUrl" class="prev" alt="">
    </el-dialog>

  </div>
</template>
 
<script>

// 引入lodash 依赖包
import _ from 'lodash'

export default {
  data () {
    return {
      // 控制步骤条激活的索引值
      activeIndex: '0',
      // 添加表单的数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 级联选择器选中的id值的数据
        goods_cat: [],
        // 上传的图片路径的数组
        pics: [],
        // 商品介绍
        goods_introduce: '',
        // 商品的静态参数与动态属性
        attrs: []
      },
      // 添加表单的数据的验证对象
      addFormRules: {
        goods_name: [{ required: true, message: '请输入商品名称', trigger: 'blur' }],
        goods_price: [{ required: true, message: '请输入商品价格', trigger: 'blur' }],
        goods_weight: [{ required: true, message: '请输入商品重量', trigger: 'blur' }],
        goods_number: [{ required: true, message: '请输入商品数量', trigger: 'blur' }],
        goods_cat: [{ required: true, message: '请选择商品分类', trigger: 'blur' }],
      },
      // 商品分类数据列表
      cardList: [],
      // 级联选择器的配置对象
      caseProps: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      // 动态参数列表数据
      manyTableData: [],
      // 静态属性列表数据
      onlyTableData: [],
      uploadURL: 'https://www.liulongbin.top:8888/api/private/v1/upload',
      // 为上传图片添加请求头
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      // 上传图片的完整url 路径
      prevPathUrl: '',
      // 控制预览图片对话框的显示与隐藏
      prevDialogVisible: false
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取商品分类数据
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类数据列表失败')
      }
      this.cardList = res.data
      console.log(this.cardList);

    },
    // 级联选择器发生改变触发这个函数
    handleChange () {
      console.log(this.addForm.goods_cat);
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    // tab标签的name值发生改变触发该函数  实现商品分类为必选项
    beforeTabLeave (newTabsName, oldTabsName) {
      if (oldTabsName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请选择商品分类')
        return false
      }
    },
    // tabs 标签的点击事件 当 标签发生点击事件时  触发该时间
    async tabsClick () {
      // 证明获取动态参数面板
      if (this.activeIndex === '1') {
        // 发起请求 获取参数列表数据
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'many' } })

        if (res.meta.status !== 200) return this.$message.error('获取参数失败')
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
        console.log(this.manyTableData);

      } else if (this.activeIndex === '2') { // 证明获取静态列表数据
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'only' } })
        if (res.meta.status !== 200) return this.$message.error('获取参数失败')

        this.onlyTableData = res.data
        console.log(this.onlyTableData);
      }
    },
    // 处理图片预览效果
    handlePreview (file) {
      // console.log(file);
      this.prevPathUrl = file.response.data.url
      console.log(this.prevPathUrl);
      this.prevDialogVisible = true

    },
    // 处理移除图片操作
    handleRemove (file) {
      // console.log(file);
      // 获取将要删除的临时路径
      const RemovePath = file.response.data.tmp_path
      // 在pics数组中找出相应的索引值
      const i = this.addForm.pics.findIndex(path => path.pic === RemovePath)
      // 使用splice方法删除该路径
      this.addForm.pics.splice(i, 1)
      console.log(this.addForm);


    },
    // 添加图片成功时 触发这个函数
    handleSuccess (response) {
      // console.log(response);
      const picInfo = {
        pic: response.data.tmp_path
      }
      this.addForm.pics.push(picInfo)
      console.log(this.addForm.pics);

    },
    // 点击添加按钮添加商品
    Add () {
      this.$refs.addFormRef.validate(async valid => {
        // 表单预验证
        if (!valid) {
          return this.$message.error('请输入添加必添项')
        }
        // 发起 请求添加商品  因为 good_cat与商品分类的级联选择器做了双向绑定 必须为数组
        // 所以我们需要将addform 进行深拷贝  使用 lodash 的cloneDeep() 进行深拷贝 
        // 防止报错
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        // 处理静态参数
        this.manyTableData.forEach(item => {
          const arrInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(arrInfo)
        })
        // 处理动态属性
        this.onlyTableData.forEach(item => {
          const arrInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(arrInfo)
        })
        form.attrs = this.addForm.attrs
        console.log(form);
        const { data: res } = await this.$http.post('goods', form)
        if (res.meta.status !== 201) {
          return this.$message.error('添加商品失败')
        }
        this.$message.success('添加商品成功')
        this.$router.push('/goods')
      })
    }
  },
  computed: {
    // 获取级联选择器选中的三级分类的id
    cateId () {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  },

}
</script>
 
<style scoped lang = "less">
.el-checkbox {
  margin: 0 10px 0 0 !important;
}
.prev {
  width: 100%;
}
.addBtn {
  margin-top: 15px;
}
</style>